[Zubersoft]

You may need to uninstall the Windows 10 version in order to install the beta version. You can back up your library first and then restore it in the beta version. Or you can just copy the storage location for MobileSheets, uninstall the app, and then copy those files back (if you are using a custom storage location, make sure to copy C:\Users\<your username>\AppData\Local\Packages\41730Zubersoft.MobileSheets_ys1c8ct2g6ypr\LocalState as well) . Make sure you don't allow the Microsoft Store to install version 2.1.9 either (you'll probably need to disable automatic updates). I'm going to work on creating a version 2.1.9 with additional logging for errors tonight. 

Mike